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/* p is an initialized QSprob, a handle to an existing LP problem */
/* Get the value of the dual variable for constraint r2. */
int rval;
double val;
rval = QSget_named_pi (p, "r2", &val);
if (rval) {
fprintf (stderr,
"Could not get the dual value, error code %d\n", rval);
} else {
printf ("Dual value = %.6f\n", val);
}
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